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mklyk
Posts: 3 | Points: 394 | Last online: 12.14.2018
Date registered
10.23.2018
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    • mklyk has written a new blog article "The difference between the grinding wheel and the cutting piece" 12.14.2018

      Many people think that the grinding wheel and the high quality cutting disc supplier are a kind of product, and the role is the same. In fact, this is not the case. The two have essential differences. The grinding wheel can be cut, polished and polished, and the shape is different; the cutting piece is only used for cutting, and the cutting piece is further divided into a resin cutting piece, a diamond cutting piece and the like.
      Grinding wheel is the main type of grinding tool in grinding. The grinding wheel piece is a porous body which is prepared by adding a binder to an abrasive, and compacting, drying and baking. Due to the different abrasives, binders and manufacturing processes, the characteristics of the grinding wheel vary greatly, which has an important influence on the processing quality, productivity and economy of the grinding. The characteristics of the grinding wheel are mainly determined by factors such as abrasive, particle size, binder, hardness, structure, shape, and size.
      The cutting piece belongs to the grinding wheel, and is made of abrasive and the binder resin for cutting ordinary steel, stainless steel metal and non-metal materials, and is divided into a resin cutting piece and a diamond cutting piece.
      This is to explain to everyone that it is very clear, in addition to the role of cutting, there are other functions such as polishing and polishing, so there is a fundamental difference between the two, we must look for two products when buying, according to actual needs to buy.
      Method for discriminating a dicing sheet
      Our previous introduction to the cutting piece has been very detailed, including its product performance characteristics, classification, advantages and so on. As a manufacturer of cutting sheets, we mainly talk about the method of discriminating cutting pieces today. details as follows:
      1. Hold the stone cutting machine by hand, turn on the power, and frequently operate the switch by hand to make the tool start frequently, and observe whether the on/off function of the stone cutting machine switch is reliable. At the same time, observe whether there are any abnormalities in the TV sets and fluorescent lamps on the spot. In order to confirm whether the tool is equipped with a radio interference suppressor.
      2. Check the nameplate and instructions of the stone cutting machine. The nameplate parameters should be the same as those on the 3C certificate.
      3. According to the needs of users, first, distinguish between household use and special use. Since most of the power tools are designed for some special tools, they should be distinguished from the general households before purchase. Usually, their difference is in power.
      4. The stone cutting machine is energized for one minute, and the hand is held by hand. The hand should not feel any abnormal vibration. Observe the reversing spark. The reversing spark should not exceed 3/2, generally from the tool. Look inside the air inlet, there should be no obvious arc on the surface of the commutator. There should be no abnormal noise during operation.
      5. Observe the outer packaging of the stone cutting machine. The outer packaging should have a clear pattern and no damage. Open the packaging box to observe the appearance of the stone cutting machine. The color should be uniform. There should be no obvious shadows and dents on the surface of the plastic parts. There should be no scratches or Bumping marks, assembly misalignment between shell parts ≤0.5mm, aluminum castings coating smooth and beautiful without defects, the surface of the machine should be free of oil and stains.

    • mklyk has written a new blog article "Abrasive grinding method" 12.12.2018

      Finishing (such as cutting) of the machined surface by the relative movement of the lap and the workpiece under a certain pressure by the abrasive particles coated or pressed onto the lap. Grinding can be used to process a variety of metal and non-metallic materials, the surface shape of the processing is flat, inner and outer cylindrical and conical surfaces, convex, concave spherical, thread, tooth surface and other profiles. Processing accuracy can reach IT5~01.
      The grinding method can be generally classified into three types: wet research, dry research and semi-dry research.
      1 Wet grinding: Also known as sand grinding, the liquid abrasive is continuously filled or coated on the grinding surface, and the abrasive continuously slides and rolls between the workpiece and the lap to form a cutting motion. Wet grinding is generally used for coarse grinding, and the fine powder abrasive used has a particle size coarser than W7.
      2 dry research: also known as sand embedding, the thin abrasive cutting disc for metal is evenly embedded in the surface layer of the lap, only a small amount of stearic acid mixed fat and other auxiliary materials must be applied on the surface of the lap. Dry grinding is often used for fine grinding, and the fine powder abrasive used is finer than W7.
      3 Semi-dry research: similar to wet research, the abrasive used is a paste-like paste. Grinding can be done either manually or on a grinder. Before the workpiece is ground, it must be processed by other processing methods to obtain higher pre-machining precision. The remaining grinding allowance is generally 5 to 30 microns.

    • mklyk has written a new blog article "Selection points for molding and grinding" 12.10.2018

      There are four main requirements for forming abrasive grinding wheels:
      First, shape retention
      Since it is a form grinding, the most important thing is naturally the shape retention ability of the 7'' cut off disc for metal.
      Good shape retention can:
      1 to ensure the accuracy after grinding used by7" cut off disc for stainless steel
      2 reduce trimming frequency and improve processing efficiency
      Good shape retention can be achieved not only by increasing the hardness of the grinding wheel, but more importantly, the grinding wheel is stable and suitable for self-sharpening.
      Second, the surface roughness after grinding
      Many molded and finished products are part of each other. Therefore, good surface roughness reduces the resistance to actuation and increases product life.
      Therefore, after grinding a good shaped grinding wheel, the surface roughness of the workpiece should be as fine as possible!
      Third, easy to rest
      If the shape retention is good, but it is not easy to trim, it will also reduce the processing efficiency.
      It is not easy to trim, which means that the precision of molding is easy to be unstable, and the finished product after final processing is prone to the problem of poor dimensional accuracy.
      Fourth, heat dissipation
      In order to improve the shape retention, the shape grinding wheel has a lower number of tissue stages and fewer pores. However, the molding and polishing coolant is relatively difficult to enter the polishing point, and it is easy to cause problems such as burn vibration.
      Therefore, heat dissipation is also a major focus when choosing molding and grinding!

    • mklyk has written a new blog article "Resin grinding wheel equipment inspection" 12.05.2018

      1. Raw material inspection, process inspection and factory inspection are important contents for the implementation of effective inspection and control of resin grinding wheel production enterprises, but there are few production enterprises that truly standardize management and standard cut off wheel for metalstandardization management. The main problems are incomplete systems, unimplemented functions, lax management, short control of inspection equipment, and insufficient quality of inspection personnel.

      2. Inspection equipment configuration is incomplete. The inspection equipment is incomplete. The inspection equipment for resin grinding wheel has 3 large parts: rotary strength testing machine; sand blasting hardness machine (or Rockwell hardness machine)---resin slice and grinding sheet; static balance (There is also a dynamic balancer for the diamond grinding wheel), and other thin-plate grinding wheel end face, radial runout tester, inner diameter gauge, vernier caliper, grinding wheel cutting performance testing machine, etc. Inspection equipment lacks the proper maintenance and care.

      3. Selection and application of resin grinding wheel phenolic resin liquid

      The most commonly used humectant in the manufacture of resin grinding wheels is a phenolic resin liquid. When a normal resin liquid ratio is used, if the material is difficult to control dry and wet, a humectant such as furfural or dibutyl ester is used. Because furfural has good compatibility with liquid phenolic resin, it is still used in most manufacturers. However, the disadvantages of high corrosiveness, irritating odor, and damage to the health of the operating staff are obvious. Therefore, many manufacturers are looking for more suitable alternatives.

    • mklyk has written a new blog article "Profile cutting machine safe operation" 12.04.2018

      1. The operator must be familiar with the performance of the equipment and follow safe operating procedures to prevent accidents.
      2. When the cutting machine is working,durable cutting off wheelit is necessary to concentrate on not only keeping the mind clear, but also rationally operating the power tool to be exhausted, strictly prohibiting drinking or taking stimulants and drugs and then operating the cutting machine.
      3. The power supply line must be safe and reliable, and it is strictly forbidden to arbitrarily pull. Care must be taken to check the performance of the equipment before use to ensure that the parts are intact.
      4. Wear suitable overalls. Do not wear loose overalls. Do not wear jewelry or long hair. Do not wear gloves and cuffs.
      5. The machined workpiece must be firmly clamped. It is strictly forbidden to start cutting when the workpiece is not clamped.
      6. It is strictly forbidden to grind the burrs of the workpiece on the plane of the grinding wheel to prevent the grinding wheel from breaking.
      7. The operator must deviate from the front of the grinding wheel and wear protective glasses when cutting.
      8. It is strictly forbidden to use the grinding wheel with the existing defects. When cutting, it should prevent the sparks from splashing and keep away from inflammable and explosive materials.
      9. When clamping the workpiece, the clamping should be stable and firm. The protective cover must be installed correctly. After the clamping, it should be checked for dry running, and there should be no jitter or abnormal noise.
      10. When replacing a new cutting piece or a grinding wheel in the middle, do not use the locking nut too hard to prevent the saw blade or the grinding wheel from cracking.
      11. If the equipment has jitter and other faults, it should be shut down immediately for repair. It is strictly forbidden to take sickness and take stimulant and drink after operation. It is forbidden to wear gloves during operation. Wear a mask or face shield if it can cause dust during operation.

    • mklyk has written a new post " with expert skill and knowl" 12.04.2018

      SEO can help us improve our website rankings and is a good technology. Seo helps Aurora Abrasives publicity China cut off disc also raises reputation for Chinese companies

    • mklyk has written a new post "adidas nmd r1 heren zwart" 12.04.2018

      I like these products very much. I also want to add some content to my work. The7'' cut off disc for metal provided by Aurora Abrasives may help some people. This is our website: https://www.auroraabrasive .com/7-inches-stainless-steel-cutting-disc/

    • mklyk has written a new blog article "Method For Grinding Wheel In Stone Grinding Processing" 12.03.2018

      thin flat cutting disc is a method of cutting a workpiece with a fast working grinding wheel as a cutting tool on a grinding machine. The characteristics of this method are:

      (1) Since the grinding wheel itself has high hardness and heat resistance, the grinding can process materials with high hardness, such as hardened steel and hard alloy.

      (2)The temperature in the grinding zone is high due to severe friction. This can cause stress and deformation of the workpiece and even burn the surface of the workpiece. Therefore, a large amount of coolant must be injected during grinding to reduce the grinding temperature. The coolant can also act as chipping and lubrication.

      (3) The radial force during grinding is large. This results in a flexible retraction of the machine tool-grinding wheel-workpiece system, making the actual depth of cut less than the nominal depth of cut. Therefore, when the grinding is about to be completed, the knife should not be used for light grinding to eliminate the error.

      (4) After the abrasive grain is blunt, the grinding force also increases, causing the abrasive grain to break or fall off, and the sharp edge is re-appeared. This characteristic is called “self-sharpness”. Self-sharpening enables grinding to work normally in a certain period of time, but after a certain working time, manual finishing should be carried out to avoid vibration, noise, and damage to the surface quality of the workpiece.

    • mklyk has written a new blog article "Grinding wheel hardness selection" 11.30.2018

      The hardness of the grinding wheel is an important indicator to measure the "self-sharpness" of the grinding wheel. During the grinding process, the abrasive grains gradually become sharp and blunt, and some of the passivated abrasive grains continue to work, and the pressure acting on the abrasive grains will continuously increase; when the pressure is large to a certain value, some abrasive grains will Self-crushing to form a new cutting edge; when the pressure exceeds the bonding force of the bonding agent, the abrasive particles will fall off by themselves. The property of the passivated abrasive particles to be self-crushing or falling off to keep the grinding wheel sharp is called "self-sharpness". The hardness of the grinding wheel reflects the difficulty of the abrasive grains falling off the surface of the grinding wheel under the action of the grinding force. If the grinding wheel is hard, it means that the abrasive grains are hard to fall off; the grinding wheel is soft, indicating that the abrasive grains are easy to fall off. The hardness of the cut off disc for stainless steeland the hardness of the abrasive grains are two different concepts that must be clearly distinguished.

      It is not that the hardness of the diamond grinding wheel must be high. The abrasive of the ordinary abrasive grain brown corundum must be selected from the low grinding wheel. The abrasive blunt abrasive grain is not easy to fall off, the grinding wheel is easy to block, the grinding heat is increased, the workpiece is easy to burn, and the grinding is performed. The efficiency is low, which affects the surface quality of the workpiece; the grinding wheel is selected too soft, the abrasive grain is also peeled off when it is sharp, which increases the loss of the grinding wheel, easily loses the correct geometry and affects the accuracy of the workpiece. Therefore, the selection of the hardness of the grinding wheel should be appropriate. It should also be considered according to the contact area of ​​the grinding wheel and the workpiece, the shape of the workpiece, the way of grinding, the cooling method, the type of bonding agent of the grinding wheel, etc.

    • mklyk has written a new blog article "Two curing resin methods for ultra-thin cutting sheets" 11.30.2018

      The cutting piece is made of abrasive and binder resin for cutting ordinary steel, stainless steel and non-metal sheets, thin flat cutting disc is a category that is divided according to the thickness of the cutting piece. Ultra-thin dicing sheets generally have two curing methods: thermal curing resin and photo-curing resin, and two curing resin methods for ultra-thin dicing sheets are the most commonly used curing methods for cutting sheets.
      1. The thermosetting resin method generally uses a thermosetting phenolic resin as a bonding agent, and the diamond abrasive grains are mixed with a resin, and then sintered by hot pressing, and then thermally solidified and then subjected to grinding processing. This process takes several hours, so the production cost is compared. high.
      2. The photocurable resin is composed of a photocrosslinkable polymer, an initiator and an additive. It differs from the thermosetting resin in its essential nature in that the curing process is a chemical reaction caused by absorption of light radiation of a corresponding wavelength to convert the photocurable resin from a liquid to a solid. The conversion from liquid to solid is the result of an increase in molecular weight, rather than the evaporation of solvent, so it has the advantages of rapid solidification, no pollution, and energy saving, but the constraint factor is the high price of raw materials.
       Using photocurable resin as a bonding agent in the manufacture of thin flat cutting disc by photocurable resin method The ultra-thin diamond cutting wheel with a thickness of 0.15mm was successfully completed, and the cutting test of the single crystal silicon wafer was successfully completed.
       At present, with the advancement of technology, photocuring has gradually begun to replace thermal curing. It can also be seen from the above that the photocurable resin method has many advantages over the thermosetting resin method, which is why it gradually replaces the thermosetting resin method.

    • mklyk has written a new blog article "Analysis of the impact of high performance cutting disc performance" 11.29.2018

      There are many factors affecting the cutting performance of the high performance cutting disc. The ultra-thin cutting wheel is mainly used for precision grooving and cutting, and has a large grinding depth, a small feed speed, a large contact area between the grinding wheel and the workpiece, and a narrow slit. High metal removal rate, high grinding precision, good surface quality and high material utilization.
      1. Ultra-thin cutting disc abrasive grain size, thin abrasive cut off disc for stainless steeluse fine particle size, and the thinner the general thickness of the abrasive grain will be correspondingly thinner, the surface quality is good. However, the finer the abrasive grain size, the corresponding cutting sharpness decreases, and the feed rate is correspondingly reduced to accommodate the machinability of the abrasive grain size. The cutting depth of the ultra-thin cutting wheel is generally determined by the user according to the cutting part.
      Generally, the law of cutting the grinding wheel by deep-cutting and slow-feeding grinding method is that the integral-type cutting wheel has the advantages of thin thickness, fine grain size, high dimensional and shape precision, light weight, and is generally used under high speed conditions. The general speed is 5000-40000 rpm. The base type cutting grinding wheel is mostly thick (0.5-2mm), large in diameter (100-200mm), coarse in grain size and low in precision, and is generally used under conditions of lower rotation speed and large depth of cut. The general speed is 3000-10000 rpm.
      2. Balance affects cutting performance. When the cutting piece jumps large, the cutting will swing back and forth, making the cutting width larger. The consumption of the material is large, and the consumption of the cutting piece is naturally large. When the cutting piece has a large radial runout, the vibration is large at the initial stage of cutting, which tends to cause the cutting piece to fall off, affecting the strength and cutting, and automatically trimming after cutting, and the overall influence becomes small.
      3. The thickness of the cut piece affects the cutting performance. The thickness of the cutting disc is high, and the slit width will consume the cutting piece; when the strength is guaranteed, the thin flat cutting disc is recommended, which not only saves the cutting piece material but also saves the cut material;

    • mklyk has written a new blog article "CBN grinding wheels are important to the automotive industry" 11.29.2018

      For a long time to come, the automobile industry has been developing at a relatively high speed as a pillar industry of the national economy. The abrasive industry will also play an important role in this opportunity, especially the contribution of CBN grinding wheels to the automotive industry.
      In the process of using CBN grinding wheel, the abrasive particles are partially or completely detached from the grinding tool due to partial fragmentation of the abrasive particles or the breaking of the bonding agent, and the new cutting edge is continuously appeared on the abrasive surface of the grinding tool, or continuously A new sharp abrasive grain is exposed to allow the grinding tool to maintain cut off disc for stainless steel for a certain period of time. This self-sharpness of the abrasive tool is a prominent feature of the abrasive tool compared with the general tool.
      Particle size refers to the size of the abrasive particle size. The particle size is divided into two types: abrasive grains and fine powder. For abrasives with a large outer diameter grinding wheel of 40 μm, it is called abrasive particles. The classification is carried out by a screening method, and the particle size number is expressed by the number of perforations per inch of the screen through which the abrasive grains pass. An abrasive grain such as 60# indicates that it is just the size of a screen having a 60-hole per inch length. For abrasives with a particle size of less than 40 μm, it is called micropowder. The microscopic measurement was carried out, and the particle size number was represented by W and the following numerals, and the value after W represents the actual size of the fine powder. For example, W20 indicates that the actual size of the fine powder is 20 μm.
      In view of the current situation of China's automobile industry, and drawing on the mature experience of developed countries, we should mainly develop: CBN grinding disc for processing piston ring; CBN grinding wheel for resin with high precision and high wear resistance processing (including resin ceramic bonding agent); PCBN tool grinding tools, honing tools; small hole grinding heads for various hydraulic parts processing; various diamond grinding wheels and set drills for glass processing such as car window glass and automobile rearview mirrors; diamond grinding wheels for plastic and rubber non-metallic materials processing ; CPD cutters for aluminum alloy processing; diamond dressing rollers for various purposes.

    • mklyk has written a new blog article "Ceramic CBN wheel defects:" 11.28.2018

      Cubic boron nitride is not suitable for grinding hard and non-metallic hard materials. At the high temperature of grinding, CBN will react chemically in the alkaline aqueous solution. The CBN grinding wheel will decompose in the alkaline solution at 300 °C, and it will be decomposed in the boiling water. As a result, the crystal shape of the abrasive grains will be destroyed, so when grinding, Only oily coolants can be used, not water-based coolants.12 inches cut off wheel supplier shows.
      Ceramic CBN grinding wheel use range
      1. Grinding of mild steel is preferred. A lot of experience has achieved very good results for the grinding of imported and domestic stainless steel and other mild steel, and the efficiency is increased by about 100%, and the economic benefit is increased by 200%.
      2. Fine grinding and final grinding of workpieces (micro bearings, air compressors, crankshafts, camshafts, high-precision threads, instruments, etc.) that are mass-produced on automatic machine tools.
      3. Grinding of complex profile workpieces (pins, broaches, high-precision gears, masters, punches, etc.) with good angular retention.
      4. Fine grinding and final grinding of large precision workpieces (machine guides, high precision screws, etc.). The use of ordinary abrasives for these workpieces tends to cause large deformations due to high grinding temperatures. The best choice is the CBN grinding wheel.
      5. Finishing and final grinding of precision parts made of heat-resistant steel and alloy steel with high hardness (HRC55 or higher). These parts cannot be used with high precision due to the consumption or bluntness of the abrasive tools.
      6. For special steels such as tungsten, tungsten-molybdenum high-speed steel, vanadium alloy steel, cobalt alloy steel, special high-speed steel tool sharpening, super-finishing of difficult-to-machine heat-resistant steel workpieces, and honing of other steel quenching tools.
      7. Sharpening and precision of special high-speed steel tools including tungsten, tungsten-containing molybdenum and other high-speed steels, especially vanadium alloy steel and cobalt alloy steel.
      8. Fine grinding and final grinding of precision parts made of heat-resistant, stainless steel and alloy structural steel with high hardness (HRC55 or higher). These parts are worn with ordinary abrasive tools that are too expensive or too blunt to achieve high precision.
      9. Mass-produced workpieces such as instruments and miniature bearing components on automatic or semi-automatic machine tools.
      10. Grinding CBN for titanium alloy is the best choice for grinding wheel.

    • mklyk has written a new blog article "Wheel use characteristics" 11.27.2018

      Grinding application technicians are most concerned about the sharpness of the wheel and the life of the wheel. The sharpness of the grinding wheel is an important feature of the smooth progress of grinding: academically, it refers to the amount of grinding force per unit time and unit durable cutting off wheel. The smaller the grinding force, the easier it is to scribe the workpiece: the sharper the grinding wheel. The durability of the grinding wheel is also an important performance of grinding. It means that the grinding wheel starts grinding after trimming, and can not continue grinding until it needs to be re-trimmed: the total number of workpieces or the total length or total volume of the grinding wheel in this period of time . The life of the grinding wheel refers to the grinding wheel until it is used or no longer used:

      The sum of the durability of the grinding wheel. The sharpness of the grinding wheel and the life of the grinding wheel during the grinding process are two contradictions. The grinding wheel is sharp and the grinding force is small: it shows that the grinding wheel has good self-sharpness: there are new abrasive grains exposed, and the old abrasive grains fall off: it will bring about the reduction of the life of the grinding wheel; the grinding wheel has good durability and long service life, indicating that the grinding wheel is hard. The abrasive grain is not easy to be exposed, the abrasive grain is easy to passivate, and the surface of the grinding wheel is easy to block: the grinding wheel is not sharp, and the grinding force is large: the accuracy of the cutting shape is deteriorated, the collapse is large, and the burr is enlarged. Both sharpness and wheel life are reflected in the current grinding conditions: they can be adjusted appropriately by grinding process parameters, etc. within the _ range. If the grinding wheel speed is increased or the feed speed is reduced, the thickness of the single abrasive grinding is reduced, which is beneficial to reduce the grinding force: improve the sharpness of the grinding wheel and improve the grinding quality; and increase the rigidity of the process system as appropriate: reduce the cutting Grinding wheel grinding vibration, thereby improving the grinding wheel's profitability and grinding wheel life; increasing the coolant supply, helping the grinding wheel to flush, cool, and chip the chipping ability, also reducing the friction between the abrasive particles and the workpiece, reducing the grinding force: it also helps In order to improve the sharpness of the grinding wheel; and to optimize the grinding wheel dressing parameters: it can also play a good effect. However, the sharpness and service life of the grinding wheel are greatly improved. It is only realized by the grinding wheel manufacturer adjusting the internal factors of the cutting wheel (such as particle size, concentration, binder, filler, etc.) and the manufacturing process (temperature, pressure, time, etc.).

    • mklyk has written a new blog article "Grinding Wheel" 11.27.2018

      Grinding is also called grinding. Grinding is the machining of the surface of the workpiece with grinding wheels, oilstone and abrasives (particles such as alumina and silicon carbide).
      During the grinding process, after the edges of the abrasive grains are blunt, due to the action of the cutting force, they often break or fall off by themselves to reveal a new sharp sharpening. This phenomenon is called the self-sharpening of the grinding wheel. A large amount of heat is generated during the abrasive grinding process, so it is necessary to cool down with a large amount of flowing cooling water.
      Due to the multi-blade and self-sharpening characteristics of the China cut off disc, and the high cutting speed and the high precision of the grinding machine itself, the precision and surface finish of the workpiece after grinding are very high, and the general grinding accuracy is 1- Level 2, finish up to 7-▽10; precision grinding up to level 1 or above, finish up to 14 levels.

      A machine that uses a grinding wheel is usually called a grinding machine, and a machine that processes with oil stone or abrasive is called a finishing machine. A grinding wheel is a cutting tool that has many fine and extremely hard abrasive particles bonded with a bonding agent. From the point of view of its cutting action, each fine abrasive grain on the surface of the grinding wheel acts as a fine blade, and the grinding process is like cutting a number of fine blades at the same time.
      Grinding has a wide range of applications, and almost all surfaces can be machined by grinding, such as inner and outer cylindrical surfaces, inner and outer conical surfaces, various planes, and threads, gears, splines, molding surfaces, and the like. In addition, grinding can process hard materials such as hardened steel and hard alloys that are difficult to machine with general tools. Grinding is generally used as a finishing process for the surface of the part, but it can also be used for roughing operations such as pre-machining and cleaning of the blank.

    • mklyk has written a new blog article "Grinding wheel surface topography detection method (3)" 11.26.2018

      Non-contact detection
      The non-contact detection method mainly obtains the surface morphology of the grinding wheel in two ways: one is the microscope type detection method, and the surface topography information of the high performance cutting disc is obtained by microscope imaging, measurement or scanning; the other is the optical detection method, Optical measurement technology is combined with information processing technology to detect based on optical scattering or interference principles.
      Microscopic detection
      (1) Microscope quasi-focus method
      The basic principle of the detection method is to focus on the apex of the abrasive grain on the surface of the grinding wheel and the lowest point of the surrounding metal bond by using a reflective microscope, and record the change value of the scale of the focus knob, which is different from the focus knob. The product of the representative dimensions is the blade height of the abrasive particles. The smaller the size represented by each of the focus knobs, the higher the accuracy of the microscope quasi-focus method. The microscope quasi-focus method has a small investment and simple operation, and can directly detect the height of the blade of the abrasive grain; and the shape of the abrasive grain can be obtained by multiple focusing of the abrasive grain by the reflection microscope. However, the calculation of the distribution density of the abrasive particles is cumbersome, and the discrimination of the focusing condition is too subjective and the detection accuracy is low.
      (2) Binocular vision
      The binocular vision method is to capture the binocular stereo image of the surface of the grinding wheel by using a stereo microscope by imitating the human visual system. Through the analysis and processing of the image, the depth information of each point on the surface of the grinding wheel is accurately obtained, and then the surface morphology of the grinding wheel is reconstructed by modeling. The schematic diagram is shown in Fig. 5. When constructing the actual binocular vision detection system and collecting binocular stereo images, a fixed CCD camera is used to move the grinding wheel through the translation device. The method realizes the detection of the characteristic information such as the abrasive grain height, the abrasive grain spacing and the abrasive wear amount on the surface of the grinding wheel. The direct detection method has the advantages of high detection precision, intuitive detection result, high calculation efficiency, strong adaptability, and simple operation.
      2. Optical detection
      According to the different detection principles used, the optical detection method is divided into optical scattering principle detection technology and optical interference principle detection technology.
      (1) Photoelectric detection method
      The principle of photoelectric detection method is to use the light beam to project onto the surface of the grinding wheel. The edges of the abrasive cutting edge of the grinding wheel are reflected by the light, and the reflected light is injected into the photomultiplier tube through the rectangular grating, thereby obtaining the corresponding photoelectric waveform, and then amplified and limited. The amplitude and shaping get the square wave to be tested, and the computer receives the square wave signal and analyzes and processes it. The spacing and width of the square wave correspond to the abrasive grain spacing and the abrasive grain wear surface length, respectively, so that parameters such as the average abrasive grain spacing and the average abrasive grain wear surface length can be obtained. Comparing the rectangular waves detected at different stages of the grinding process, the variation of the abrasive grains (such as wear, passivation, crushing, and shedding) can be obtained, and the surface of the grinding wheel can be monitored in real time.
      This method can detect the abrasive grain spacing, density and degree of wear, but can not detect the blade height of the abrasive particles.
      (2) Light interception method
      The light interception method is also called the light cut method. The detecting device is mainly composed of an optical indexing head, a projection mirror, a microscope and the like. The principle of the optical intercept method is to rotate the indexing handle to read the spatial position of the abrasive grains on the circumference of the grinding wheel, and then use the light source in the projection mirror to illuminate the surface of the grinding wheel with a rectangular beam through the lens and the grating to form a rectangular measuring belt. The long axis is parallel to the axis of the grinding wheel. The microscope lens is tangent to the circumferential direction of the grinding wheel, and the length and axial position of the abrasive cutting edge can be measured by the graduated eyepiece in the microscope.
      This method can detect the height of the abrasive blade, but it is very cumbersome to detect the distribution density of the abrasive particles. Since the light is irradiated on the transparent object, most of the transmission and refraction occur, resulting in inconspicuous reflection effect, blurred imaging, plus the measurement field of view is a slit, the field of view is dark, it is difficult to identify the measured point, and sometimes the surface of the grinding wheel is The scratches or the pits from which the abrasive grains fall off are also misjudged as the height of the blade, so the effect of detecting the diamond grain with high transparency is not satisfactory.
      The abrasive grain density, spacing and edge height can be obtained by measuring the points on the surface of the grinding wheel. The detection method has high detection precision, but it is not suitable for surface topography detection of fine-grained grinding wheels, and the laser probe is expensive, and it is not suitable for industrial use.
      Du Fu et al. used the charge-coupled device with laser triangulation principle and laser displacement sensor to detect the contour of the diamond grinding wheel. It can convert the height value of the surface contour of the grinding wheel into the corresponding analog voltage output to achieve high-precision detection.
      (3) Laser focusing method
      Laser focusing is also called laser interferometry. At present, the most typical one is the laser probe interferometry method, which uses a very thin focused optical probe to project the surface of the grinding wheel. A reference mirror is placed near the surface of the grinding wheel. The reference light and the measuring light adopt the same path, wherein the reference light can pass through the piezoelectric actuator on the shaft. The position is slightly moved, the interference fringes are observed and stored, and the change in height on the surface causes a change in the optical path difference between the reference light and the measuring light, thereby causing a change in the signal on the photodetector; phase analysis of the interference fringe image can be performed. The actual height of the sampling point on the surface of the grinding wheel is obtained, thereby obtaining the surface profile of the grinding wheel.
      This method can detect the edge height, spacing and density of abrasive grains on the surface of the grinding wheel. This technology is highly sensitive but susceptible to vibration.
      At present, the method for detecting the surface topography of the grinding wheel is not mature enough. All kinds of testing methods can only measure one element or several elements of the grinding wheel shape. If the surface features of the grinding wheel are to be described from different angles, each testing method needs to cooperate with each other. , take advantage of each other.
      Previous Articles:Grinding wheel surface topography detection method (2)

    • mklyk has written a new blog article "Characteristics of superabrasive grinding wheel grinding" 11.23.2018

      1. Super-abrasive grinding wheel has the characteristics of good wear resistance, durable cutting off wheelstrong grinding ability and high durability. This feature is of great help for controlling the processing size and realizing the processing automation.

      2. At the same time, the super-hard abrasive wheel also has the characteristics of low grinding temperature, small grinding force, no burn and no crack, good surface quality and no change in microstructure. When grinding cemented carbide with a diamond grinding wheel, the grinding force is only 1/4 to 1/5 of that when the green silicon carbide grinding wheel is ground.

      3, high grinding efficiency, is also one of the main features of super-abrasive grinding wheel, this is because the super-hard abrasive has a sharp edge, high wear resistance, so there is a higher resection rate and grinding ratio. However, super-hard abrasive wheels have more difficult finishing problems.

      4. The most important feature of the super-abrasive grinding wheel is that the processing cost is low. Although the diamond grinding wheel and the cubic boron nitride grinding wheel are relatively expensive, the service life is long, the processing efficiency is high, the working hours are small, and the comprehensive cost is low.

    • mklyk has written a new blog article "Smart Industrial Abrasive Processing" 11.22.2018

      Information technology such as Internet of Things, big data, and cloud computing have brought new opportunities to industrial production. Traditional industries are facing changes. How to use emerging technologies to improve production efficiency and reduce manufacturing costs is the top priority of current enterprises. Germany's concept of Industry 4.0 has set off a wave of enthusiasm around the world. The United States has also proposed the Industrial Internet, which represents a new direction of industrial automation.China supply 7" cut off discuses the Internet of Things to connect all the equipment on the production site and store and analyze data through cloud computing. To further tap the enormous value behind massive data.
      With the 2018 World Internet of Things Conference in Wuxi, Jiangsu, the concept of “all things connected” gradually became clear in the public, and the “Wisdom+” scene became a reality. However, how to achieve interconnection and ensure data security in complex and ever-changing industrial scenarios has become an urgent problem to be solved. Today, this problem has a solution.
      Intelligent industrial robots are called "the pearl of the top of the manufacturing crown" and the "window" of the gold-plated "Made in China". Its research and development, manufacturing and application have become an important indicator to measure the level of technological innovation and high-end manufacturing in a country. It can be seen that the lack of robotic technology limits the scale of industrialization, while the smaller scale also constrains the development of technology, which affects the industrialization process of robots. Experts in the industry believe that if we want to improve the market competitiveness of grinding robots, we must expand the production of grinding robots and increase the production capacity of grinding robots. On the other hand, we must promote the optimization of key components of grinding robots and improve key zeros. The production capacity of components and the need to expand the capacity of grinding robots.
      Why do you need to develop a grinding robot? Industrial robots are depreciated according to the 10-year service life. The annual cost of producing products is about 50,000 yuan, and the cost of three mature welding and cutting technicians is at least 216,000 yuan per year. When an industrial robot produces the same benefit, the cost of input is 23% of the labor cost. This ratio will greatly reduce the manufacturing costs of enterprises and provide a broad space for corporate profits.

    • mklyk has written a new blog article "Shaft part grinding process" 11.21.2018

      For the case of external grinding, the working steps are as follows:
      (1) Wipe the center hole at both ends of the workpiece and scrape the center hole at both ends. Grinding of precision parts can be arranged in the middle of the order 1-2 times.
      (2) Adjust the head and tail limit blue, so that they are in the symmetrical position of the lower T center.
      (3) Trimming the grinding wheel.
      (4) Install a suitable collet on the end of the workpiece head; add lubricating oil to the center hole; adjust the tail seat according to the length of the workpiece
      Set, the J: piece is placed between the two sets of fire.
      (5) Adjust the position of the reversing block on the front side of the grinder table. The position of the right reversing block should be such that the table can be fed to the grinding wheel.
      When the end face of the workpiece is about one-third of the width of the standard cut off wheel for metal, it is reversed; the left-hand reversing block should feed the table to the side of the grinding wheel.
      Close to the end of the chuck or step and reverse the moment.
      (6) Select the appropriate workpiece speed according to the material, diameter, length and processing requirements of the workpiece.
      (8) Rotate the lateral direction into the wheel to make the grinding wheel recede a distance. In order to avoid hitting the workpiece when the grinding wheel is quickly introduced. Quick reference
      After entering, slowly bring the grinding wheel closer to the workpiece.
      (9) Rough grinding is performed on an external surface of the step shaft in the middle of the step shaft, and the upper and lower tables are adjusted during the rough grinding process.

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